Existence and asymptotic behavior of the positive solutions of neutral impulsive differential equations. Neliniini Kolyvannya, [S. l.], v. 8, n. 3, p. 304–318, 2005. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/357. Acesso em: 22 jan. 2026.